98 Safari Starting Problem

Heater core was replaced (the engine ran hot due to the problems with the heater core). Check engine light came on one day after heater core was replaced. Mechanic replaced EGR valve based on diagnostics. Next day the van wouldn't start, engine turns over, but will not start. It was apparent that the fuel pump was not turning on. After checking several connections and such, the fuel pump engaged and the engine started a couple of times; however, the fuel pump stopped engaging. Question: Could the replacement of the EGR valve effect the fuel pump? No starting problems were experienced until after the ERG valve was replaced.

Welcome to the forum!

A couple of things for the record: The heater core can not cause the engine overheat, even if it's totally restricted. Something else was done to repair the overheating. The EGR valve has nothing to do with the fuel pump. A faulty EGR valve can cause stalling, hesitation, and poor idle quality, but it will not cause a no start condition. From the symptoms you have described, it appears that the fuel pump not running, is and has been, your no start problem all along. Intermittent problems are difficult to diagnose, knowledge and patience are 2 invaluable tools necessary to locate and repair the root cause of the problem. Is this something you will be repairing and need assistance with, or are you just looking for advice?

Thanks for the reply Old Master.

Heater core leaked coolant - passanger side carpet was soaked, my wife for some reason can not smell the anti- freeze ,but did notice when the tempature gauge went into the Red. Had heater core replaced by local machanic, next day after van pick up the check engine light comes on, return to machanic replaced EGR valve, drive home, next day engine will not start .
First thing I notice was the absence of the fuel pump hum when I turn the switch. Checked fuse and removed and reinstalled relay - fuel pump still will not turn on. Tried several time with about 30 sec. in between for reset, finally pump turn on and engine started twice, let set for about 30 minutes ,tried agian and fuel pump back to not turning on.

Didn't really think heater core or EGR valve would cause problem with the fuel pump ,but wanted to make sure I added this weeks full history.

Weather here is starting to get better so I will try to fix this my self.

Any help and advice with the troubleshooting this would be great.

Thanks

Unfortunately the only way to check the connections at the pump is to lower the tank. Fuel pump wiring is a small gauge wire and therefore dependent on clean, tight connections. Loose and/or corroded connections increase resistance in the circuit and will affect the performance and life of the pump. There are connections on the module that should be checked also, which requires removing the module from the fuel tank. The ground wire is connected to the frame, follow the harness back from the pump and you'll see it. The ground is for both the fuel pump and fuel level sending unit. It is entirely possible that the pump motor has developed "dead spots" in the armature. If that's the case, the motor would operate intermittently and require replacement. Post back your results.